|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | On the combined effect of soil fertility and topography on tree growth in subtropical forest ecosystems—a study from SE China显示文摘Aims The aim of our research was to understand small-scale effects of topography and soil fertility on tree growth in a forest biodiversity and ecosystem functioning(BEF)experiment in subtropical SE China.Methods Geomorphometric terrain analyses were carried out at a spatial resolution of 5×5 m.Soil samples of different depth increments and data on tree height were collected from a total of 566 plots(667 m2 each).The soils were analyzed for carbon(soil organic carbon[SOC]),nitrogen,acidity,cation exchange capacity(CEC),exchangeable cations and base saturation as soil fertility attributes.All plots were classified into geomorphological units.Analyses of variance and linear regressions were applied to all terrain,soil fertility and tree growth attributes.Important Findings In general,young and shallow soils and relatively small differences in stable soil properties suggest that soil erosion has truncated the soils to a large extent over the whole area of the experiment.This explains the concurrently increasing CEC and SOC stocks downslope,in hollows and in valleys.However,colluvial,carbon-rich sediments are missing widely due to the convexity of the footslopes caused by uplift and removal of eroded sediments by adjacent waterways.The results showed that soil fertility is mainly influenced by topography.Monte-Carlo flow accumulation(MCCA),curvature,slope and aspect significantly affected soil fertility.Furthermore,soil fertility was affected by the different geomorphological positions on the experimental sites with ridge and spur positions showing lower exchangeable base cation contents,especially potassium(K),due to leaching.This geomorphological effect of soil fertility is most pronounced in the topsoil and decreases when considering the subsoil down to 50 cm depth.Few soil fertility attributes affect tree height after 1-2 years of growth,among which C stocks proved to be most important while pH_(KCl)and CEC only played minor roles.Nevertheless,soil acidity and a high proportion of Al on the exchange complex affected tree height even after only 1-2 years growth.Hence,our study showed that forest nutrition is coupled to a recycling of litter nutrients,and does not only depend on subsequent supply of nutrients from the mineral soil.Besides soil fertility,topography affected tree height.We found that especially MCCA as indicator of water availability affected tree growth at small-scale,as well as aspect.Overall,our synthesis on the interrelation between fertility,topography and tree growth in a subtropical forest ecosystem in SE China showed that topographic heterogeneity lead to ecological gradients across geomorphological positions.In this respect,small-scale soil-plant interactions in a young forest can serve as a driver for the future development of vegetation and biodiversity control on soil fertility.In addition,it shows that terrain attributes should be accounted for in ecological research. | Thomas Scholten Philipp Goebes Peter Kühn Steffen Seitz Thorsten Assmann Jürgen Bauhus Helge Bruelheide Francois Buscot Alexandra Erfmeier Markus Fischer Werner Härdtle Jin-Sheng He Keping Ma Pascal A.Niklaus Michael Scherer-Lorenzen Bernhard Schmid Xuezheng Shi Zhengshan Song Goddert von Oheimb Christian Wirth Tesfaye Wubet Karsten Schmidt | 2017 | Journal of Plant Ecology2017，10，1： | 22 |
| 2 | Interspecific and intraspecific variation in specific root length drives aboveground biodiversity effects in young experimental forest stands显示文摘Aims Although the net biodiversity effect(NE)can be statistically partitioned into complementarity and selection effects(CE and SE),there are different underlying mechanisms that can cause a certain partitioning.Our objective was to assess the role of resource partitioning and species interactions as two important mechanisms that can bring about CEs by interspecific and intraspecific trait variation.Methods We measured tree height of 2493 living individuals in 57 plots and specific root length(SRL)on first-order roots of 368 of these individuals across different species richness levels(1,2,4,8 species)in a large-scale forest biodiversity and ecosystem functioning experiment in subtropical China(BEF-China)established in 2009.We describe the effects of resource partitioning between species by a fixed component of interspecific functional diversity(RaoQ)and further effects of species interactions by variable components of interspecific and intraspecific functional diversity(community weighted trait similarity and trait dissimilarity,CWS and CWD).Finally,we examined the relationships between biodiversity effects on stand-level tree height and functional diversity(RaoQ,CWS and CWD)in SRL using linear regression and assessed the relative importance of these three components of functional diversity in explaining the diversity effects.Important Findings Our results show that species richness significantly affected SRL in five and tree height in ten out of 16 species.A positive NE was generally brought about by a positive CE on stand-level tree height and related to high values of RaoQ and CWS in SRL.A positive CE was related to high values of all three components of root functional diversity(RaoQ,CWS and CWD).Our study suggests that both resource partitioning and species interactions are the underlying mechanisms of biodiversity effects on stand-level tree growth in subtropical forest. | Wensheng Bu Bernhard Schmid Xiaojuan Liu Ying Li Werner Härdtle Goddert von Oheimb Yu Liang Zhenkai Sun Yuanyuan Huang Helge Bruelheide Keping Ma | 2017 | Journal of Plant Ecology2017，10，1： | 18 |
| 3 | Impact of tree diversity and environmental conditions on the survival of shrub species in a forest biodiversity experiment in subtropical China显示文摘Aims Although shrubs are an important component of forests,their role has not yet been considered in forest biodiversity experiments.In the biodiversity-ecosystem functioning(BEF)experiment with subtropical tree species in south-east China(BEF-China),we factorially combined tree with shrub species-diversity treatments.Here,we tested the hypotheses that shrub survival differs between the 10 planted shrub species,with lower survival rates of late-than early-successional species and is affected by environmental conditions,such as topography and top soil characteristics,as well as by biotic factors,represented by tree,shrub and herb layer characteristics.Methods We analyzed the survival of 42000 shrub individuals in 105 plots varying in tree and shrub species richness of the BEF-China project four years after planting.Shrub survival was analyzed with generalized linear mixed effects models at the level of individuals and with variance partitioning at the plot level.Random intercept and random slope models of different explanatory variables were compared with respect to the Bayesian Information Criterion(BIC).Important Findings Survival rates differed largely between the 10 shrub species,ranging from 26%to 91%for Ardisia crenata and Distylium buxifolium,respectively.Irrespective of species identity,single abiotic factors explained up to 5%of species survival,with a negative effect of altitude and slope inclination and a positive effect of the topsoil carbon to nitrogen ratio,which pointed to drought as the major cause of shrub mortality.In contrast,neither tree nor shrub richness affected shrub survival at this early stage of the experiment.Among the biotic predictors,only herb layer species richness and cover of the dominant fern species(Dicranopteris pedata)affected shrub survival.Overall,our models that included all variables could explain about 65%in shrub survival,with environmental variables being most influential,followed by shrub species identity,while tree species diversity(species richness and identity)and herb layer characteristics contributed much less.Thus,in this early stage of the experiment the biotic interactions among shrubs and between shrubs and trees have not yet overruled the impact of abiotic environmental factors. | Bo Yang Ying Li Bingyang Ding Sabine Both Alexandra Erfmeier Werner Härdtle Keping Ma Bernhard Schmid Thomas Scholten Gunnar Seidler Goddert von Oheimb Xuefei Yang Helge Bruelheide | 2017 | Journal of Plant Ecology2017，10，1： | 7 |
| 4 | Molecular diagnostics in a teacup:Non-Instrumented Nucleic Acid Amplification(NINA) for rapid,low cost detection of Salmonella enterica显示文摘We report on the use of a novel non-instrumented platform to enable a Loop Mediated isothermal Amplification(LAMP) based assay for Salmonella enterica.Heat energy is provided by addition of a small amount(<150 g) of boiling water,and the reaction temperature is regulated by storing latent energy at the melting temperature of a lipid-based engineered phase change material.Endpoint classification of the reaction is achieved without opening the reaction tube by observing the fluorescence of sequence-specific FRET-based assimilating probes with a simple handheld fluorometer.At or above 22℃ ambient temperature the non-instrumented devices could maintain reactions above a threshold temperature of 61℃ for over 90 min-significantly longer than the 60 min reaction time.Using the simple format,detection limits were less than 20 genome copies for reactions run at ambient temperatures ranging from 8 to 36℃.When used with a pre-enrichment step and non-instrumented DNA extraction device,trace contaminations of Salmonella in milk close to 1 CFU/mL could be reliably detected.These findings illustrate that the non-instrumented amplification approach is a simple,viable,low-cost alternative for field-based food and agricultural diagnostics or clinical applications in developing countries. | KUBOTA Ryo LABARRE Paul WEIGL Bernhard H LI Yong HAYDOCK Paul JENKINS Daniel M | 2013 | Chinese Science Bulletin2013，58，10： | 4 |
| 5 | Stent Thrombosis With Ticagrelor Versus Clopidogrel in Patients With Acute Coronary Syndromes: An Analysis From the Prospective, Randomized PLATO Trial显示文摘 | P. Gabriel Steg Robert A. Harrington H?kan Emanuelsson Hugo A. Katus Kenneth W. Mahaffey Bernhard Meier Robert F. Storey Daniel M. Wojdyla Basil S. Lewis Gerald Maurer Lars Wallentin Stefan K. James | 2013 | Circulation2013，，10： | 2 |
| 6 | Early lactate clearance is associated with improved outcome in severe sepsis and septic shock显示文摘 | H Bryant Nguyen Emanuel P. Rivers Bernhard P. Knoblich Gordon Jacobsen Alexandria Muzzin Julie A. Ressler Michael C. Tomlanovich | 2004 | Critical Care Medicine2004，，8： | 2 |
| 7 | Austenite Grain Size in the Continuous Casting Proeess显示文摘 | Reiter J Bernhard C Presslinger H | 2008 | Metallographic Methods and Evaluation Materials Characterization2008，59，6： | 1 |
| 8 | Relay-based deployment concepts for wireless and mobile broadband radio显示文摘 | PABST R BERNHARD W H DANIEL S C | 2004 | IEEE Communication Magazine2004，42，9： | 1 |
| 9 | Rigorous modeUlng of NOx absorption in tray and packed columns显示文摘 | BERNHARD H EUGENY Y K | 2005 | Chemical Engineering Science2005，6，02： | 1 |
| 10 | Recent advances in chlorophyll biosynthesis and breakdown in higher plants显示文摘 | ULRICH E BERNHARD G STEFAN H | 2004 | Plant Molecular Biology2004，56，1： | 1 |
| 11 | Space shuttle meteoroid and orbital debris impact damage显示文摘 | Bernhard R P Christiansen E L Kerr J H | | 0，，： | 1 |
| 12 | Generation of immunostimulatory dendritic cells from human CD34^+ hematopoietic progenitor cells of the bone marrow and peripheral blood显示文摘 | BERNHARD H DISIS M L HEIMFELD S | 1995 | Cancer Res1995，55，5： | 1 |
| 13 | Recent advances in chlorophyll biosynthesis and breakdown in higher plants显示文摘 | Ulrich Eckhardt Bernhard Grimm Stefan H?rtensteiner | 2004 | Plant Molecular Biology2004，，1： | 1 |
| 14 | Quality of life in breast cancer patients-not enough attention for long-term survivors 显示文摘 | Bernhard H Georg K Martin K | 2001 | Psyehosomatics2001，42，2： | 1 |
| 15 | Parochial altruism in humans 显示文摘 | Bernhard H Fisehbaeher U Fehr E | 2006 | Nature2006，442，7105： | 1 |
| 16 | Correction of laser scanning intensity data: Data and model-driven approaches显示文摘 | Bernhard H?fle Norbert Pfeifer | 2007 | ISPRS Journal of Photogrammetry and Remote Sensing2007，，6： | 1 |
| 17 | Complex macromolecular architecture design via cyclodextrin host/ guest complexes显示文摘 | Bernhard V K Schmidt J Martin H | 2014 | Progress in Polymer Science2014，39，： | 1 |
| 18 | Granulocyte-macrophage colony-stimulating factor:an effective adjuvant for protein and peptide-basedvaccines显示文摘 | DISIS M L BERNHARD H SHIOTA F M | 1996 | Blood1996，88，1： | 1 |
| 19 | Flame retardaney mechanisms of aryl phosphates in combination with boehmire in bisphenol A polycarbonate/ acrylonitrile-butadienestyrene blends显示文摘 | Kristin H Pawlowski Bernhard Schartel | 2008 | Polymer Degradation and Stability2008，93，3： | 1 |
| 20 | Impact of nutrition on PCB toxicity显示文摘 | Zuzana M Elizabeth O Michal T Bernhard H | 2007 | Environmental Toxicology and Pharmacology2007，25，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员